Meek Mill shared a video Monday of Bob's birthday surprise, in which Sixers partner Michael Rubin walked Kraft out of his house -- decked out in Pats gear -- to present him with his brand new blue Bentley ... something he apparently really desired.

Kraft seemed elated and mystified, asking, "How the fudge did you get it?" ... to which Rubin replied, "We have resources."

Rubin let Kraft know a handful of other rich dudes went in on his new whip -- including Meek and Jay-Z -- and it rode on a flatbed from Florida to arrive in pristine shape.